Upgrade electrical from two prong to three prong

[Starbuck]

I just bought a 1971 SW home. I want to upgrade two prong to three prong outlets to use my PC, printer, flat-panel TV, and microwave oven. Should I have a licensed electrician do this, DIY?, and have you any idea of electrician cost? My guess is 3 to 4 outlets would suffice. Thank you! (You have a very informative site here. I really appreciate learning so much.)

[David Oxhandler]

The third prong is a ground. Talk to a licensed electrician For many older manufactured homes the frame is tied to a ground rod. If this is the case then the addition of a few outlets grounded to the frame might be a reasonable solution. Only an experienced electrician can make this call after inspecting your home.

Ask about upgrading the wiring in the home. Many older homes have service that is just not big enough anymore, with all of the new "gadgets" that are usually in use in our homes today. I would consider the grounding of one or more outlets only a temporary solution.

Your electrician can ground an outlet with the proper gauge wire run from the ground screw(green) of a new three prong outlet to a copper ground rod. In many parts of the country This rod should be at least 8' long and 5/8" in diameter. It needs to be driven into the ground with only about 6" sticking out. There is a special ground clamp for connecting the wire to this installation.

While this is not a complicated operation local codes and ground conditions can vary quiet a bit and unless you have a lot of experience it is best to have this done by a professional

[Winningham]

I understand something called a belly wrap or such is under the floor of a trailer. I am in the process of having the floor replaced with new plywood. The trailer is 30 years old so don't know if it ever had one. Do we need to put one down? There will be new insulation under the floor. At one time I saw a cut out of trailer construction and it showed a belly ?? but I can't find that drawing again. Need an answer ASAP
Thank you